CN1641815A - Operating unit for knife switch - Google Patents

Operating unit for knife switch Download PDF

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Publication number
CN1641815A
CN1641815A CN 200410015022 CN200410015022A CN1641815A CN 1641815 A CN1641815 A CN 1641815A CN 200410015022 CN200410015022 CN 200410015022 CN 200410015022 A CN200410015022 A CN 200410015022A CN 1641815 A CN1641815 A CN 1641815A
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CN
China
Prior art keywords
gear
operating
operator
axis
backboard
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN 200410015022
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Chinese (zh)
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CN100355004C (en
Inventor
刘朝清
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LKE (ZHUHAI) CO Ltd
Original Assignee
LKE (ZHUHAI) CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to CNB2004100150221A priority Critical patent/CN100355004C/en
Publication of CN1641815A publication Critical patent/CN1641815A/en
Application granted granted Critical
Publication of CN100355004C publication Critical patent/CN100355004C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The invention relates to an operation structure for knife switch that can be operated both by electro-motion and hand operated and the both operation methods are independent. It comprises backboard, panel, mainly knife operation structure, ground knife operation structure, switch in energy storage structure, switch off energy storage structure, motor and motor driving structure. The mainly knife operation structure includes a motor output axis, and the motor output structure includes the third gear, the fourth gear, chain, the fifth gear, and the sixth gear. The third gear is installed on the motor output axis and joggling with the fourth gear. The chain connects the fourth gear and the fifth gear, and the fifth gear is joggling with the sixth gear. The six gear is installed on the mainly knife operation axis. Comparing to the technology in existence, it can be operated both by electro-motion and hand independently.

Description

A kind of operating mechanism that is used for knife switch
[affiliated technical field]
The present invention relates to a kind of operating mechanism, particularly a kind of operating mechanism that is used for knife switch.
[background technology]
As a kind of advanced person's knife switch, high pressure knife switch particularly both can manual operation, can electric operating be development trend again, and operator more is inevitable with the anti-mutually interlocking of ground cutter; Yet operating mechanism is manual operation in traditional knife switch, and operator is not high with the degree of safety of the anti-mutually interlocking of ground cutter, exist to operator, the hidden danger of cutter misoperation.
Along with the progress of society, the development of electric power industry, create a kind ofly simple in structurely understand, mounting or dismounting, maintenance are convenient, both can manual operation, again can electric operating, the reliable and stable knife switch of the anti-mutually interlocking of operator ground cutter is imperative.
[summary of the invention]
The object of the present invention is to provide a kind of not only can manual operation but also can electrically operatedly be used for the operating mechanism of knife switch.
Another object of the present invention is to provide the operating mechanism that is used for knife switch of a kind of manual operation and electric operating mutually noninterfere.
The object of the present invention is achieved like this: this operating mechanism that is used for knife switch comprise backboard, panel, operator operating mechanism, cutter operating mechanism, combined floodgate stored energy mechanism, separating brake stored energy mechanism, motor and electric transmissio mechanism, this operator operating mechanism comprises an operator operating axis, this motor comprises a motor output shaft, and this electric transmissio mechanism connects operator operating axis and motor output shaft.
Further improvement of the present invention is: this motor transmission mechanism comprises the 3rd gear, the 4th gear, chain, the 5th gear and the 6th gear; The 3rd gear is installed on motor output shaft, itself and the 4th gear interlock, and chain connects the 4th gear and the 5th gear, and the 5th gear cooperates with the 6th gear, and it includes toothed portion and no toothed portion, and the 6th gear is installed on the operator operating axis.
Compared to prior art, motor and the electric transmissio mechanism of being provided with of the present invention makes the present invention not only can realize manual operation but also can electric operating.The 5th gear of electric transmissio mechanism is divided in addition toothed portion and no toothed portion, and during manual operation, the no toothed portion of the 5th gear is mutually close with the 6th gear, the 6th gear and the 5th not interlock of gear, i.e. the 6th gear rotation and the 5th gear does not rotate; Do not influence manual operation.During electric operating, the 5th gear rotates under the gearing of motor and electric transmissio mechanism, and the 5th gear has turned to toothed portion, with the 6th gear interlock, drives the 6th gear and also rotates again, realizes electric operating.
[description of drawings]
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 to Fig. 3 is a stereogram of the present invention, and wherein panel is removed in Fig. 2;
Fig. 4 is the right view of Fig. 1;
Fig. 5 is the A-A face cut-away view of Fig. 4, the operator of this state, cutter all disconnect;
Fig. 6 is the B-B face cut-away view of Fig. 4, the operator of this state, cutter all disconnect;
Fig. 7 is the A-A face cut-away view of Fig. 4, the operator of this state closes a floodgate, cutter disconnect;
Fig. 8 is the B-B face cut-away view of Fig. 4, the operator of this state closes a floodgate, cutter disconnect;
Fig. 9 is the A-A face cut-away view of Fig. 4, the operator of this state disconnects, cutter close a floodgate;
Figure 10 is the B-B face cut-away view of Fig. 4, the operator of this state disconnects, cutter close a floodgate;
Figure 11 is the stereogram of stored energy mechanism of the present invention.
[embodiment]
See also Fig. 1, Fig. 2 and Fig. 3, a kind of operating mechanism that is used for knife switch comprise motor 1, electric transmissio mechanism, backboard 36, panel 35, operator operating mechanism, cutter operating mechanism, combined floodgate stored energy mechanism 17, separating brake stored energy mechanism 18 and tripping mechanism.Motor 1 is positioned on backboard 36 and panel 35 two boards, and it has a motor output shaft 2.Electric transmissio mechanism is positioned at backboard 36 outsides, and it is connected between the motor output shaft 2 and operator operating mechanism of motor 1.The operator operating mechanism, cutter operating mechanism, combined floodgate stored energy mechanism and separating brake stored energy mechanism be located between backboard 36 and the panel 35.Tripping mechanism is positioned under backboard 36 and the panel 35.
See also Fig. 2, Fig. 4 and Fig. 5, the operator operating mechanism comprises operator operating axis 10, operator operating axis 10 is having operator operation board 32 respectively near panel 35 1 ends, on operator operation board 32, also be provided with main shaft connecting lever 11, it is connected by I type pin with dropout frame iron plate 12, trip(ping) bar 13, dead ejector pin 43 is housed on the dropout frame iron plate 12, and dead ejector pin 43 has bit-avoiding slot, and dropout frame iron plate 12 outsides of one end have one to thread off 44; Trip(ping) bar 13 can be connected with II type pin 14 with wearing around set square between set squares 15 that axle 16 rotates, guide rail bar 47, the energy storage plate 20; Set square 15 adopts two up and down; Combined floodgate stored energy mechanism 17 is located between the two II type pins 14 at the two ends that connect guide rail bar 47, and the middle part of energy storage plate 20 is equipped with short main shaft 21, and under the effect of combined floodgate stored energy mechanism 17, the other end of energy storage plate 20 is pressed on the excircle of square axis 22.Offer bit-avoiding slot on the square axis 22.Separating brake stored energy mechanism 18 is located between the II type pin 14 and sluice separating spring seat pin 19 on the set square 15 another one angles.Sluice separating spring seat pin 19 is fixed between backboard 36, the panel 35.
See also Fig. 4 and Fig. 6, operator operating axis 10 is being provided with operator limit cam 26 near backboard 36 places, and sluice separating spring seat pin 19 is being provided with square axis swinging plate 24 near backboard 36 places, and square axis 22 is being provided with square axis connecting lever 23 near backboard 36 places.Operator limit cam 26 has a recess.36 of square axis connecting lever 23 and backboards are provided with a connecting lever preloading spring 45.
Please consult Fig. 4, Fig. 5 and Fig. 6 again, ground cutter operating mechanism comprises earth's axis operating axis 34, and earth's axis operating axis 34 is being provided with earth's axis guide vane end stop 25 be provided with ground cutter operation board 33 near panel 35 places near backboard 36 places.Earth's axis guide vane end stop 25 has a recess.
Please consult Fig. 1 again, electric transmissio mechanism comprises first gear 3, second gear 4, the 3rd gear 5, the 4th gear 6, chain 7, the 5th gear 8 and the 6th gear 9.First tooth 3 and the 3rd gear 5 are installed on motor output shaft 2, second gear 4 and the 4th gear 6 are installed on same axle, wherein first gear 3 and 4 interlocks of second gear, the 3rd gear 5 and 6 interlocks of the 4th gear, chain 7 connects the 4th gear 6 and the 5th gear 8, the 5th gear 8 cooperates with the 6th gear 9, and the 6th gear 9 is installed on operator operating axis 10.Wherein the 5th gear 8 is divided into toothed portion and no toothed portion, and during manual operation, the no toothed portion of the 5th gear 8 is mutually close with the 6th gear 9, the 6th gear 9 and the 8 not interlocks of the 5th gear, i.e. the 6th gear 9 rotations and the 5th gear 8 does not rotate; Do not influence manual operation.During electric operating, the 5th gear 8 rotates under the gearing of motor 1 and electric transmissio mechanism, and the 5th gear 8 has turned to toothed portion, with 9 interlocks of the 6th gear, drives the 6th gear 9 and also rotates again, realizes electric operating.
See also Fig. 2, Fig. 3 and Fig. 6, tripping mechanism comprises separate winding 31, crash panel 37, crash panel axle 38, connecting lever 39, pull bar 40, connecting lever 41 and tripping operation transmission combination 42.Separate winding 31 and crash panel 37 are between backboard 36 and panel 35, crash panel axle 38 passes backboard 36 and panel 35, one end of connecting lever 39 is installed on crash panel axle 38, the other end is connected with an end of pull bar 40, the other end of pull bar 40 is connected with an end of connecting lever 41, the other end of connecting lever 41 connects tripping operation transmission combination 42, and backboard 36 is passed in tripping operation transmission combination 42, and its position is near dead ejector pin (43).After separate winding 31 energisings, separate winding 31 can promote crash panel 37, by crash panel axle 38, connecting lever 39, pull bar 40, connecting lever 41, tripping operation transmission combination 42, tripping operation transmission combination 42 bumps thread off 44, make 44 rotations of threading off, thereby driving dead point pin 43 rotates, bit-avoiding slot on the dead point pin 43 is kept away the position, makes separating brake stored energy mechanism 18 instantaneous relase energy pulling energy storage plate 20 that operator is disconnected.
Please consult Fig. 6 again, the present invention also is provided with sensitive switch 28, sensitive switch 29 and sensitive switch 30 on backboard 36.Sensitive switch 28 is arranged at operator limit cam 26 both sides with sensitive switch 29.Sensitive switch 30 is arranged at earth's axis guide vane end stop 25 next doors.When operator limit cam 26 bumped sensitive switch 28, the motor output shaft 2 of motor 1 can rotate counterclockwise.When operator limit cam 26 bumped sensitive switch 29, the motor output shaft 2 of motor 1 can clockwise rotate.When earth's axis guide vane end stop 25 bumped sensitive switch 30, motor 1 can not start.
See also Fig. 1, Fig. 7 and Fig. 8, when motor 1 energising, motor output shaft 2 changes clockwise, under the gearing of motor output shaft 2, first gear 3, second gear 4, the 3rd gear 5, the 4th gear 6, chain 7, the 5th gear 8, the 6th gear 9, drive operator operating axis 10 and clockwise rotate.Under the transmission of operator operating axis 10, operator operation connecting lever 11, dropout frame iron plate 12,13 effects make it upwards push away II type pin 14 to I type pin to trip(ping) bar, itself exist simultaneously around I type pin and clockwise rotate trend (owing to be subjected to the spacing of dead ejector pin 43, it can not rotate around I type pin), set square 15 is subjected to thrust to wear axle 16 rotations around set square, because energy storage plate 20 is subjected to square axis 22 spacing, sluice separating spring seat pin 19 is fixed between backboard 36, the panel 35, so combined floodgate stored energy mechanism 17 and 18 energy storage simultaneously of separating brake stored energy mechanism.
After operator operation board 32 turns over certain angle, operator limit cam 26 bumps sensitive switch 28, and push square axis swinging plate 24 simultaneously, square axis swinging plate 24 is stirred square axis connecting lever 23 makes it drive square axis 22 rotations, bit-avoiding slot on the square axis 22 is kept away the position, combined floodgate stored energy mechanism 17 instantaneous relase energy promote energy storage plate 20 and drive short main shaft 21 rotations, the lock that closes of operating; Operator limit cam 26 bumps sensitive switch 28 and disconnects, and motor 1 stops.This state main shaft connecting lever 11 has been crossed the dead point, and it is stable to keep operator to close a floodgate.Sensitive switch 29 closes in the indent of operator limit cam 26; Because dead 43 pairs of trip(ping) bars of ejector pin is spacing, separating brake stored energy mechanism 18 reaches the highest energy storage state, and separating brake stored energy mechanism 18 promotion set squares have around triangle it and wear the trend that axle rotates counterclockwise, and trip(ping) bar has the trend that clockwise rotates around I type pin.
See also Fig. 5 and Fig. 6, (1) after motor 1 energising, motor output shaft 2 changes counterclockwise, at motor output shaft 2, first gear 3, second gear 4, the 3rd gear 5, the 4th gear 6, chain 7, the 5th gear 8, under the gearing of the 6th gear 9, driving operator operating axis 10 rotates counterclockwise, by operator operating axis 10, operator operation connecting lever 11, dropout frame iron plate 12 and dead ejector pin 43 drive threads off 44 around 10 rotations of operator operating axis, bit-avoiding slot on the dead ejector pin 43 is kept away the position, separating brake stored energy mechanism 18 instantaneous relase energy, promotion set square 15 is worn axle 16 around set square and is rotated counterclockwise, thereby by guide rail bar 47 pulling energy storage plates 29 operator is disconnected.Simultaneously, square axis 22, dead ejector pin 43 are replied under the preloading spring effect.(2) or by separate winding 31 switch on, separate winding 31 promotes crash panels 37, by crash panel axle 38, connecting lever 39, pull bar 40, connecting lever 41, tripping operation transmission combination 42, dropout 44 makes it drive dead point pin 43 and rotates, bit-avoiding slot on the dead point pin 43 is kept away the position, and combined floodgate stored energy mechanism 18 instantaneous relase energy pulling energy storage plate 20 disconnects operator.If manual operation: directly being rotated counterclockwise operator operation board 32 can finish.At this moment, sensitive switch 28 closes in the indent of limit cam 26, and limit cam 26 bumps sensitive switch 29 and disconnects.
When the fusing of fuse overload; by crash panel axle 38, connecting lever 39, pull bar 40, connecting lever 41, tripping operation transmission combination 42; dropout 44 is rotated dead point pin 43; bit-avoiding slot on the dead point pin 43 is kept away the position; combined floodgate stored energy mechanism 18 instantaneous relase energy promote energy storage plate 20 and drive short main shaft 21 rotations; operator is disconnected, realize overload protection.
The present invention can realize operator, the multiple anti-mutually interlocking of cutter operation.See also Fig. 5, operator operation board 32 of the present invention, cutter operation board 33 all designed a groove, operator, cutter off-state all, two grooves are relative, can operate this moment to arbitrary operation board 32,33.See also Fig. 7 and Fig. 9, when one of them operation board place closure state, an operation board just edge is enclosed within the groove of another operation board, and restriction is to the operation of another operation board.See also Figure 10, when using electronic 1 to operate, when local cutter was closed, operation earth's axis guide vane end stop 25 was collided with sensitive switch 30, and sensitive switch 30 disconnects, and at this moment, branch, combined floodgate shift knob all can't be operated.Please Fig. 6 and Fig. 8, when local cutter disconnected, sensitive switch 30 was in operation earth's axis guide vane end stop 25 indent, and sensitive switch 30 closes, and at this moment, divides, the combined floodgate shift knob all can operate; Also anti-mutually interlocking during electric operating.
See also Figure 11, stored energy mechanism of the present invention comprises combined floodgate, separating brake stored energy mechanism, and this stored energy mechanism all is made of an energy storage pillar 170, one energy storage rod 171 and one energy-stored spring 172; The middle small column of energy storage pillar 170 and the interstitial hole of energy storage rod 171 are made matched in clearance; Energy-stored spring 172 is enclosed within energy storage pillar 170, the energy storage rod 171, and two ends are pressed in two inner faces of energy storage pillar 170, energy storage rod 171 respectively with certain precompression.
The present invention is provided with motor and electric transmissio mechanism, makes the present invention not only can realize manual operation but also can electric operating.The 5th gear 8 is divided in addition toothed portion and no toothed portion, and during manual operation, the no toothed portion of the 5th gear 8 is mutually close with the 6th gear 9, the 6th gear 9 and the 8 not interlocks of the 5th gear, i.e. the 6th gear 9 rotations and the 5th gear 8 does not rotate; Do not influence manual operation.During electric operating, the 5th gear 8 rotates under the gearing of motor 1 and electric transmissio mechanism, and the 5th gear 8 has turned to toothed portion, with 9 interlocks of the 6th gear, drives the 6th gear 9 and also rotates again, realizes electric operating.
Although the present invention describes with reference to specific embodiment, this description and not meaning that is construed as limiting the present invention.With reference to description of the invention, other of the disclosed embodiments change, and all can expect for those skilled in the art.Therefore, such variation can not break away from affiliated claim restricted portion and spirit.

Claims (10)

1. operating mechanism that is used for knife switch, it comprise backboard (36), panel (35), operator operating mechanism, cutter operating mechanism, combined floodgate stored energy mechanism (17) and separating brake stored energy mechanism (18), this operator operating mechanism comprises an operator operating axis (10), it is characterized in that: this operating mechanism also comprises motor (1) and electric transmissio mechanism, this motor (1) comprises a motor output shaft (2), and this electric transmissio mechanism connects operator operating axis (10) and motor output shaft (2).
2. operating mechanism according to claim 1 is characterized in that: this motor transmission mechanism comprises the 3rd gear (5), the 4th gear (6), chain (7), the 5th gear (8) and the 6th gear (9); The 3rd gear (5) is installed on motor output shaft (2), itself and the 4th gear (6) interlock, chain (7) connects the 4th gear (6) and the 5th gear (8), the 5th gear (8) cooperates with the 6th gear (9), it includes toothed portion and no toothed portion, and the 6th gear (9) is installed on operator operating axis (10).
3. operating mechanism according to claim 2, it is characterized in that: this electric transmissio mechanism also comprises first gear (3) and second gear (4), first gear (3) and the 3rd gear (5) are installed on motor output shaft (2), second gear (4) is installed on same axle with the 4th gear (6), and first gear (3) and second gear (4) interlock.
4. operating mechanism according to claim 3 is characterized in that: this motor (1) is positioned on backboard (36) and panel (35) two boards, and electric transmissio mechanism is positioned at backboard (36) outside.
5. operating mechanism according to claim 4, it is characterized in that: the operator operating axis (10) of this operator operating mechanism is having operator operation board (32) respectively near panel (35) one ends, on operator operation board (32), also be provided with main shaft connecting lever (11), it is connected by I type pin with dropout frame iron plate (12), trip(ping) bar (13), dead ejector pin (43) is housed on the dropout frame iron plate (12), dead ejector pin (43) has bit-avoiding slot, and there is a dropout (44) in dropout frame iron plate (12) outside of one end; Trip(ping) bar (13) can be connected with II type pin (14) with wearing around set square between a set square (15) that axle (16) rotates, guide rail bar (47), the energy storage plate (20); Set square (15) adopts two up and down; Combined floodgate stored energy mechanism (17) is located between the two II type pins (14) at the two ends that connect guide rail bar (47), the middle part of energy storage plate (20) is equipped with short main shaft (21), under the effect of combined floodgate stored energy mechanism (17), the other end of energy storage plate (20) is pressed on the excircle of square axis (22); Square axis offers bit-avoiding slot on (22); Separating brake stored energy mechanism (18) is located between the II type pin (14) and sluice separating spring seat pin (19) on set square (15) the another one angle; Sluice separating spring seat pin (19) is fixed between backboard (36), the panel (35); Operator operating axis (10) is locating to be provided with operator limit cam (26) near backboard (36), sluice separating spring seat pin (19) is locating to be provided with square axis swinging plate (24) near backboard (36), and square axis (22) is locating to be provided with square axis connecting lever (23) near backboard (36); Operator limit cam (26) has a recess; Be provided with a connecting lever preloading spring (45) between square axis connecting lever (23) and backboard (36).
6. operating mechanism according to claim 5, it is characterized in that: this ground cutter operating mechanism comprises earth's axis operating axis (34), earth's axis operating axis (34) is locating to be provided with ground cutter operation board (33) near panel (35), locating to be provided with earth's axis guide vane end stop (25) near backboard (36), earth's axis guide vane end stop (25) has a recess.
7. operating mechanism according to claim 6 is characterized in that: this operating mechanism also comprises a tripping mechanism, and this tripping mechanism comprises separate winding (31), crash panel (37), crash panel axle (38), connecting lever (39), pull bar (40), connecting lever (41) and tripping operation transmission combination (42); Separate winding (31) and crash panel (37) are positioned between backboard (36) and the panel (35), crash panel axle (38) passes backboard (36) and panel (35), one end of connecting lever (39) is installed on crash panel axle (38), the other end is connected with an end of pull bar (40), the other end of pull bar (40) is connected with an end of connecting lever (41), the other end of connecting lever (41) connects tripping operation transmission combination (42), and backboard (36) is passed in tripping operation transmission combination (42), and its position is near dead ejector pin (43).
8. operating mechanism according to claim 7, it is characterized in that: this operating mechanism also comprises sensitive switch (28), sensitive switch (29) and sensitive switch (30), sensitive switch (28) is arranged at operator limit cam (26) both sides with sensitive switch (29), and it is other that sensitive switch (30) is arranged at earth's axis guide vane end stop (25).
9. operating mechanism according to claim 8 is characterized in that: operator operation board (32), cutter operation board (33) be equipped with one can make operator operation board (32), the mutual groove of anti-interlocking of cutter operation board (33).
10. operating mechanism according to claim 1 is characterized in that: this combined floodgate, separating brake stored energy mechanism (17), (18) are all by an energy storage pillar (170), and an energy storage rod (171) and an energy-stored spring (172) constitute; The interstitial hole of the middle small column of energy storage pillar (170) and energy storage rod (171) is made matched in clearance; Energy-stored spring (172) is enclosed within energy storage pillar (170), the energy storage rod (171), and two ends are pressed in two inner faces of energy storage pillar (170), energy storage rod (171) respectively with certain precompression.
CNB2004100150221A 2004-01-07 2004-01-07 Operating unit for knife switch Expired - Fee Related CN100355004C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2004100150221A CN100355004C (en) 2004-01-07 2004-01-07 Operating unit for knife switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2004100150221A CN100355004C (en) 2004-01-07 2004-01-07 Operating unit for knife switch

Publications (2)

Publication Number Publication Date
CN1641815A true CN1641815A (en) 2005-07-20
CN100355004C CN100355004C (en) 2007-12-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
CNB2004100150221A Expired - Fee Related CN100355004C (en) 2004-01-07 2004-01-07 Operating unit for knife switch

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102184802A (en) * 2011-01-07 2011-09-14 无锡市锡山湖光电器有限公司 Anti-rotation device of vacuum circuit breaker hand-operated energy storage closing pressure spring
CN103021721A (en) * 2012-12-14 2013-04-03 北海银河开关设备有限公司 Three-position switch spring operating mechanism

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2593343Y (en) * 2003-01-08 2003-12-17 埃尔凯电器(珠海)有限公司 Electric operation mechanism of load switch
CN2674624Y (en) * 2004-01-07 2005-01-26 埃尔凯电器(珠海)有限公司 Operating mechanism for knife switch

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102184802A (en) * 2011-01-07 2011-09-14 无锡市锡山湖光电器有限公司 Anti-rotation device of vacuum circuit breaker hand-operated energy storage closing pressure spring
CN103021721A (en) * 2012-12-14 2013-04-03 北海银河开关设备有限公司 Three-position switch spring operating mechanism

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Granted publication date: 20071212

Termination date: 20150107